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  1. Prepare
  2. Java
  3. Data Structures
  4. Java Arraylist
  5. Discussions

Java Arraylist

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  • gkanbargi
     + 0 comments

    import java.io.; import java.util.;

    public class Solution {

    public static void main(String[] args) throws IOException{
    BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
    int totalLine=Integer.parseInt(br.readLine());
    ArrayList<Integer> alllines=new ArrayList<Integer>();
    for(int i=0;i<totalLine;i++)
    {
        String line=br.readLine();
        String linevalues[]=line.split(" ");
        for (String s:linevalues)
        {
            alllines.add(Integer.parseInt(s));
        }
    }
    int totalQueries=Integer.parseInt(br.readLine());
    for(int i=0;i<totalQueries;i++)
    {
        String line=br.readLine();
        String linevalues[]=line.split(" ");
        int lineNumber=Integer.parseInt(linevalues[0]);
        int position=Integer.parseInt(linevalues[1]);
        int k=0;
        boolean found=false;
        int foundValue=0;
        int totalNumbers=0,countInLine=0,line2=0;

        for(int traverse:alllines){
            k++;

            if(k==1) {
                totalNumbers=traverse;
                countInLine=0;
                line2=1;
                continue;
            }
            countInLine++;
            if(countInLine>totalNumbers) {
                totalNumbers=traverse;
                 countInLine=0;
                 line2++;
                 continue;
            }
            if(lineNumber==line2 && countInLine==position) {
                found=true;
                foundValue=traverse;
            }

        }
        if(found==true){
            System.out.println(foundValue);
        } else {
            System.out.println("ERROR!");
        }

    }
}

    }

  • aryansolanki1723
     + 0 comments

    import java.util.*;

    public class Solution {

    public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
    int num1=in.nextInt();
    ArrayList<ArrayList<Integer>> matrix = new ArrayList<>();
    for(int i=0;i<num1;i++){
        int n=in.nextInt();
        ArrayList<Integer> row = new ArrayList<>();
        for(int j=0;j<n;j++){
            row.add(in.nextInt());
        }
        matrix.add(row);
    }
    int disp=in.nextInt();
    for(int i=0;i<disp;i++){
        int x=in.nextInt()-1;
        int y=in.nextInt()-1;
        if(x<matrix.size() && y< matrix.get(x).size()){
            System.out.println(matrix.get(x).get(y));
        }
        else{
            System.out.println("ERROR!");
        }

    }
    in.close();
}

    }

  • ilambrev
     + 0 comments
    import java.util.*;

public class Solution {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int counter = Integer.parseInt(scanner.nextLine());
        List<String[]> numbers = new ArrayList<>();
        for (int i = 0; i < counter; i++) {
            String row = scanner.nextLine(); 
            numbers.add(row.isBlank() ? new String[0] : row.split("\\s+"));
        }
        counter = Integer.parseInt(scanner.nextLine());
        for (int i = 0; i < counter; i++) {
            String[] tokens = scanner.nextLine().split("\\s+");
            int row = Integer.parseInt(tokens[0]);
            int col = Integer.parseInt(tokens[1]);
            if (row - 1 < numbers.size() && col < numbers.get(row - 1).length) {
                System.out.println(numbers.get(row - 1)[col]);
            } else {
                System.out.println("ERROR!");
            }
        }
        scanner.close();
    }
}

  • gurvinder9824
     + 0 comments
        Scanner scan = new Scanner(System.in);
    int n = scan.nextInt();

    ArrayList<String> arrayList = new ArrayList<>();
    while(n>0) {

        int a=scan.nextInt();
        if(a > 0) {
            arrayList.add(scan.nextLine());
        } else {
            arrayList.add("");
        }

        n--;
    }                

    int q = scan.nextInt();

    while(q>0){

        int x = scan.nextInt();
        int y = scan.nextInt();

        try{
            String str = arrayList.get(x-1);

            if(!str.isEmpty()) {
                String[] strArr = str.trim().split(" ");
                System.out.println(strArr[y-1]);
            } else {
                System.out.println("ERROR!");    
            }
        } catch(IndexOutOfBoundsException e) {
            System.out.println("ERROR!");
        }

        q--;
    }


}

    }

  • mufaddal_maimoon
     + 0 comments

    Scanner sc = new Scanner(System.in); int n = sc.nextInt();

        List<List<Integer>> lines = new ArrayList<>();

    for(int i = 0; i<n; i++)
    {
        int d = sc.nextInt();
        List<Integer> line = new ArrayList<>();

        for(int j=0; j<d; j++)
        {
            line.add(sc.nextInt());
        }
        lines.add(line);
    }

    int q = sc.nextInt();

    for(int i=0; i<q;i++)
    {
        int x = sc.nextInt();
        int y = sc.nextInt();

        try 
        {
            System.out.println(lines.get(x-1).get(y-1));
        }
        catch (IndexOutOfBoundsException e) 
        {
            System.out.println("ERROR!");
        }
     }

}